Dental water heater



July 25, 1933. R. M. KERR DENTAL WATER HEATER Filed June 16, 1930 \il l11 MIN INVENTOR Eafir/Z Kerr ATTORNEY Patented July 25, 1933 UNITE n;STATES PATENT 'i oF Fl fcE;

, 30mm KERR, or Damon, "MICHIGA nss'IeNon ro nnainorr nrnv'rni; nunnurncTUBING COMPANY, on ETROIT, MICHIGAN, ,a conron'ntrlonjon MICHIGAN nnnmtwiirnnnmirna Applicationfiled June 16,,

This invention relates generally to-heating apparatus and refers moreparticularly to a device capable of accurately heating a substance topredetermined temperatures.

The invention-while capable ofzmany and diversified uses findsparticular utility when used .in connection with dentistry for-exflpanding or otherwise COnCllt-lOIllIlg,L: wax

impression prior tovmaking the mold. Itis well established in the artofdentistry that different metals when molded, shrink varyingamounts andinorderto compensate for this shrinkage, it is essential to expand thewax an amount substantially equal to the shrinkage of the particularmetal-used prior to molding the latter so tliatwhen the'metal shrinksupon cooling in the wax impression,

the finished mold will accurately correspond tothe cavity for which'itis designed, Thus, it will be observed that-the degree ofiaccuracy ofthe workperformed depends-largely construction of the apparatus forheating the wax to accurate predetermined-temperatures. Theaboveapparatus will be made lmore apparentias this descriptiomproceeds,

, especially whenconsidered in connection with theaccompanymg drawing,wherein:

Figure 1 1S-21. p6I'Sp8CtlVQ'V16W otaheat-f ring device constructedinaccordance with this invention, and, I v. A

; F gureQ isa CIOSS-SQClil OIlflhYlQWj taken on the line 22 of Figure 1.x

Referring-now more in detail to the drawing and with special, referenceto vFigure 1,

it will be noted that my improvedheating apparatus comprises a table '10having a a metallic top 11 preferably-formed of a material of highthermo-conductivityand nor- ,mally supported in spaced relation ifrom asuitable platform by means of the legs 12. Supportedin anysuitablemanner from the table 10.beneath the top 11thereofandadjacentone end of the same is 'a suitable heat producing unit13. The heating unit 13 in'ay be offany conventional type, but hereinshown for the purpose of illustration as an -electric "heating elementcomprising'a coil csub'sequentlyused,in-the mold since it is ..2L1'1Clextending longitudinally -:.th'ereof as [of temperature of the (contentswithin; the

4930. Serial no. 4815583;

adapted to beconnected to -a -suitable-source of electrical energythrough a switch .14. Resting upon the top-surface oftheplateaortabletop ll abovethe heating unit 13 ,=is

a suitable ring or holder 14. adapted {toaencircle a suitable :container15 which, like the plate, '11, isprfeferably formed of amaterial ofhightl1ermo-c0nductivity so'thati-the heat from thetable will be rapidlytransmitted "totheco'ntainer 4 WVhen'the'device is used in connectionwith dentistry for heat. treating "wax aim pressions \to expandthersame, the container ispreferablyfilled withwat'er or other suitablefluidand the Wax impressions deposited T therein. {As} previouslydescribed, extreme care mustfibe taken that thefdegree'of expansion ofthe wax impressions correspond to the characteristics ofitheparticular'metal well iestablished that these metals shrink when allowedto .cool. "In: order to control :thedegree of expansion. of; the waximpressions, 'it is necessaryto heat the latterfito predeterminedspecified temperatures. 'rFor" accomplishing this a result, thecontainer l '15 vis mounted upon the table 1(l1for adjustmentlongitudinallythereof relative to the heat-- F, or: accuratelyadjustingthe container 515', as-specified above, I provide a carriage 16 having aportion 17 secured in any suitable mannerfi'to thefsidewwallof thering-514;" and-slidably mounted upon i'the'gtop surface of the plate 11.In order to guide/the por tion 17. is anaccurate predetermined path,

.the carriage 16 iisxfurtherprovided with a reduced portion 18 slidablymounted vwithin a suitable-slot 19 formed-in -thaplate? 11 clearly shownin Figure lof the drawing. The carriage 16v is held J in assembledrelation with the table byzmeans-of anf'enlarged Iportion20 arrangedbelowthe plate 'llr and engageable with the =lower"surf-ace thereof uponopposite sides of the slot '19 as will "be app'arent from- Figure' Qofthe drawing.

Thus, it will be observed that mpvement 'of the carriage l'Bivit-hinthefslot 19 effects a movement ofthe container l5 lorigit-udinally ofthe'pIateTllWand 'rel a-tive toith'e heating unit 13. Move en dot thcontainerishtive tothe h'eatingunit "13' effects achange curatelycontrolled by moving the container either toward or away from the heaterpre determined distances.

In order to accurately control the temperature of the contents in thecontainer, I'provide a seri'es'of graduations designated gen-. erally bythe reference character 21 and arranged in'spaced relationlongitudinally of the slot 19 as clearlyshown inFigure 1.

Each of the graduations 21 correspond to a predetermined temperature andare so calibrated that when the edge 22 ofthe carriage 16 is inregistration with one of the graduations, the temperature of thecontents -of'the container is exactly the same as the temperaturerepresented by the graduation.

.In other words,'if it is desired to heat the contents of the containerto 212 7 for example, the edge 22 of the carriage is caused to registerwith the first graduation, prefera, ably identified by the number 212,at which other'hand, if'it is: desired to heat the con- :25

" Thus, it will be observed that as the con-.

. ample,the edge 22 of the carriage is moved into registration with theparticular gradtime then-container assumes a position directly overtheheating element 13. On the tents of the receptacle to 200 for example,the edge 22 of the carriage 16 is caused to register with thegraduationidentified by the number'200 at which time the container -15 assumes aposition uponthe plate 11 at a point spaced from the heatingunit 13;

tainer is moved away from the heating-elev ment 13, the temperature ofthe. contents therein is successively lowered. The foregoingconstruction is such that when it is desired to fashion a mold of gold,for exuation 21 corresponding to the temperature Thus, insuringfmhandle25 secured to the opposite end thereof and vhaving the inner end-portioncthereofljournaled within the enlarged portion 20 of the carriage andprovided with a pinion 24L. pThe pinion'24 is adapted to mesh with asuitable rack 26 formed upon the under surface of the plate llandextending substantially parallel to the slot .19.

The construction is such that rotation of the handle 25 eitects amovement of the pinion -24 longitudinally of the rack 25 and, since thecarriage is attached to the shaft 24:, the

latter will be moved within the slot 19.

WhatfI claim as my invention is: 1. In a heatingdevicmthe combination asubstantially flat plate, of a heating plate. I

element disposed beneath a portion of the platefor heating various partsthereof to difierent temperatures, a container mounted for slidingmovement over the plate in a predetermined path toward and from'theheating element and adapted to contain the substance to be heated, andgraduations spaced along the path of travel of the container forindicating the temperature to which the contents of the container isadapted to be heated whenthe latter is in engagement with variousportions of the 2. In a heating device, the'combination heating variousparts of the plate to different temperatures, a holder adjustablymounted relative to the'plate and adapted to support the material to beheated, and means foradjusting the holderto predeterinined parts of theplate toheat the material carried thereby to the temperature of saidpart-s. 1 i.

3. In a heating element, the combination "with a substantially flatplate, of means for with asubstantially flat plate, of means for heatingvarious parts of the plate to different temperatures, graduations uponsaid plate corresponding to predetermined temperatures, a containerslidably' mounted upon the plate and adapted to support the material tobe heated, and means for adjusting the container-on the plate toposition thesame relativeto the graduations and thereby effect a heatingof the contents therein to accurate predetermined temperatures. i

4. In a heating -device,-the combination with a substantially flatplate, of means for heating lvarious parts ofthe plate to difierenttemperatures,'a" substance to be heated 5 slidable relative, to thePlate, graduations for indicating the temperature to which the substanceis adapted to be heated'when in predetermined positions relative to theplate, and-mechanism for effecting a slidingmovement of the substanceover the plateto' position the same relative to the graduationsaforesaid and thereby'heat the subtures.

stance to accurate predetermined tempera- "with a substantially flatplate, of a heating 1' element disposed beneath a portion of theplatefor heating various parts of the latter to difleren't temperatures,a holder slidably engaging the plate and adapted to support thesubstance to be heated, mechanism for sliding the holder over the platerelative to theheating element to position ,the'same over the variousparts aforesaid of the plate, and means for indicating the temperature'to which the substance is adapted to be heated when the holder ispositionedover I 5. Ina heating device, the combination 7 the variousparts of the plate permittingrlzo element disposed beneath a portion ofthe plate for heating various parts of the latter to differenttemperatures, a container mounted for sliding movement on the plate in arectilinear path toward and from the heating element and adapted tocontain the substance to be heated, mechanism for advancing thecontainer along saidpath, graduations spaced along the path of travel ofthe container for indicating the temperature to which the contents ofthe container is adapted to be heated when the latter is in engagementwith different portions of the plate, and means movable with thecontainer adapted to selectively register with said graduations wherebythe contents of the container is heated to accurate predeterminedtemperatures depending upon the V particular graduation with which saidlastmentioned means is registered.

7 In a heating device, the combination with a heating element, of asubstantially flat plate disposed over the heating element slidablyengaging the plate and adapted to contain the substance to be heated, amember engaging the container having a portion projecting into the slotfor guiding the container throughout a predeterminedpath of traveltoward and from the heating element, means engageable with the portionaforesaid of the member for adjusting said container along the plate,and graduations spaced along one side of the slot for indicating thetemperature to which the contents of the container is adapted to beheated when the container is in engagement with diflerent portions ofthe plate.

8. In a heating device, the combination with a plate member, of aheating element disposed beneath a portion of the plate member, acontainer slidably mounted upon the plate member in a predetermined pathrelative to the heating element and adapted to contain the substance tobe heated, a plurality of graduations spaced longitudinally of the pathof travel of the container for indicating the temperature of variousportions of the plate member, and means for sliding the container alongthe plate member to position the same relative to said graduations andthereby effect a heating of the contents of the container to thedifferent temperatures of the various portions of the plate indicated bysaid graduations.

9. In a heater, the combination with a metallic support, of a heatingappliance operatively associated therewith for heating differentportions thereof to different predetermined temperatures, a holdermounted upon the support for travel in a predetermined path, andgraduations extending along said path from the heating appliance forindicating the temperatures the substance supported by the holder isadapted to be heated when the latter is in heat con ducting relationwith various portions of the support.

10. In a heating device, the combination with a support formed of amaterial of high thermo-conductivity, of a heating element associatedwith the support for heating the same, a container arranged in directheat conducting relation to the support, said heating element andcontainer mounted for relative sliding movement withrespect to thesupport for heating the contents of the.

container to various temperatures, and graduations upon the support forindicating the temperatures to whichv the contents of the container isadapted to be heated when the latter and heating element a're'indiflerent relative positions. l

11. Ina heating device, the combination with a support, of a heatingelement associated with the support for heating the same, a containerarranged in direct heat conducting relation to the support, mechanismfor adjustingthe relative positions of the container and heating elementfor heating-the contents of the container to various temperatures, andmeans associated with said support for indicating the temperatures atwhich the contents of the container is adapted to be heated when thelatter and heating element are in different relative positions- 12. Ina. heating device, the combination with a support, of a heating elementassociated with the support for heating various portions of the same todifferent temperatures, a container arranged in direct heat conductingrelation to the support, and

means for relatively moving the container and heating element in apredetermined path with respect to the support for heating the contentsof the container to various-different temperatures.

13. In a heating device, the'combination with a support, of a heatingelement associated with the support for heating various portions of thesame to different tem peratures, a container arranged in direct ingelement.

ROBERT KERR.

